Replacing PCV valve with breather?
Thread Starter
|
Elder User
Joined: Jan 2004
Posts: 887
Likes: 0
From: Colorado
Replacing PCV valve with breather?
I have a 79 f250 4x4 with a mild built 400 in it. I drive it daily and bracet race it on the weekends. So far my best ET is a 14.332, at Bandimere speedway in Denver....
I realized the other day, that no real "race" engines at the track have PCV valves. i know PCV valves are basically to meter the crankcase vent rate. Just wondering if there would be any advantages, or disadvantages to removing the PCV valve, and just sticking a breather in the valve cover, and running 2 breathers, and no PCV valve, even though i drive it everyday. I have no emissions stuff on the engine, and do not need emissions...
anyones imput, or experience would be great, thanks. I know i would have to retune my carb to compensate for the air that is being introduced right now by the PVC valve, but i think a rejet on the carb would be more consistant than counting on the varrying amount of air supplied by the PCV valve.
Thanks, John
I realized the other day, that no real "race" engines at the track have PCV valves. i know PCV valves are basically to meter the crankcase vent rate. Just wondering if there would be any advantages, or disadvantages to removing the PCV valve, and just sticking a breather in the valve cover, and running 2 breathers, and no PCV valve, even though i drive it everyday. I have no emissions stuff on the engine, and do not need emissions...
anyones imput, or experience would be great, thanks. I know i would have to retune my carb to compensate for the air that is being introduced right now by the PVC valve, but i think a rejet on the carb would be more consistant than counting on the varrying amount of air supplied by the PCV valve.
Thanks, John
Postmaster
Joined: Aug 2001
Posts: 4,270
Likes: 4
From: Delaware
I have two large vent filters on my Ford Racing tall valve covers, and no PCV valve. I did this when I converted to EFI and I didn't want to run a hose from a valve cover vent to my cold air intake. So I removed the PCV valve.
If any pressure builds up, it will push oil out any hole that it can find. Use valve cover vents with large openings for adequate breathing.
If any pressure builds up, it will push oil out any hole that it can find. Use valve cover vents with large openings for adequate breathing.
Mountain Pass
Joined: Mar 2006
Posts: 207
Likes: 78
Run a PCV. You need to pull the blow by gasses out of the crank case. The "real" race cars use evac tubes in the header collectors - they work based off a low pressure area created in the header collector at speed. If your truck has an exhaust system, that setup will not work for you. So run a PCV on one side and a filter in the breather on the other. My "real" race car has about 1600 passes on it and I run a PCV.
Thread
Thread Starter
Forum
Replies
Last Post
johnson2007
1973 - 1979 F-100 & Larger F-Series Trucks
2
Aug 21, 2011 11:39 PM
4rdnut
1973 - 1979 F-100 & Larger F-Series Trucks
4
Dec 22, 2010 03:28 PM
madrox
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
5
Dec 17, 2009 06:09 PM
